fork_test: fork_01.c
	-$(CC) $^ -o $@
	-./$@
	-rm $@
other: execve_02_other.c
	-$(CC) $^ -o $@
# $< 第一个依赖文件
execve_test: execve_02.c other
	-$(CC) $< -o $@
	-./$@
	-rm $@ other
waitpid: waitpid_03.c 
	-$(CC) $^ -o $@
	-./$@
	-rm $@ 
signal: signal_04.c 
	-$(CC) $^ -o $@
	-./$@
	-rm $@ 